Platinum enhanced textured growth of grain-aligned YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]] thick films

Journal Article · Sun May 15 04:00:00 EDT 1994 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.355719· OSTI ID:7072574

Wegmann, M R; Lewis, J A ^[1]; Platt, C E ^[2]

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1. Science and Technology Center for Superconductivity, and the Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
2. Science and Technology Center for Superconductivity, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

The effects of magnetic alignment, heat treatment, and substrate interactions on the microstructural development and properties of YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]] (Y123) thick films were studied. Aligned films were formed by vacuum filtrating a particulate suspension in a 7 T applied field. These films and nonaligned control films were fired on either platinum (Pt) foil or magnesium oxide (MgO) substrates to various maximum temperatures between 930 and 1040 [degree]C. Optical microscopy revealed large differences in microstructural development between the various films. Aligned Y123 films fired on Pt foil exhibited the best microstructural properties. Via plasma emission spectroscopy and secondary ion mass spectroscopy, approximately 0.1 wt % Pt was found distributed throughout the films fired on platinum, while negligible amounts of Mg were detected in the films fired on MgO substrates. Differential thermal analysis revealed that, in the presence of Pt, the peritectic temperature (1030 [degree]C for pure Y123 in O[sub 2]) is reduced 70 [degree]C, thereby opening a substantial thermal processing window for partial melt assisted growth of textured Y123. SQUID measurements of magnetic hysteresis and [ital T][sub [ital c]] provided quantitative evidence that, relative to the films fired on MgO, those fired on Pt exhibited enhanced texture development [[Delta][ital M]([ital H][sub app][parallel][ital c] axis)/[Delta][ital M]([ital H][sub app][perpendicular][ital c] axis)=2.6 at 5 K, 1 T] and properties (Bean model [ital J][sub [ital c],[ital m]]=5[times]10[sup 4] A/cm[sup 2] at 5 K, 4 T) without degradation of the [ital T][sub [ital c]] characteristics.

• DOE Contract Number: FG02-91ER45439
• OSTI ID: 7072574
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 75:10; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELEMENTS
FILMS
GRAIN ORIENTATION
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
METALS
MICROSTRUCTURE
ORGANIC COMPOUNDS
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
QUATERNARY COMPOUNDS
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TEXTURE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES